阿秒
极端紫外线
干涉测量
光学
光谱学
物理
瞬态(计算机编程)
折射
紫外线
超短脉冲
激光器
天文
计算机科学
操作系统
作者
Akihiro Oshima,Hiroki Mashiko,Ming-Chang Chen,Ikufumi Katayama,Jun Takeda,Katsuya Oguri
标识
DOI:10.1038/s42005-025-02269-w
摘要
Abstract Understanding optical properties in the extreme ultraviolet (XUV) region requires access to the dynamical electronic wave functions across a broad energy range. However, time-resolved spectroscopic tools to probe the real and imaginary parts of electric susceptibility in a wide portion of the XUV region remain limited. Here, we demonstrate transient complex refraction spectroscopy using double isolated attosecond pulses (DAPs) to investigate dynamical autoionization in argon. By combining DAPs-based spectral interferometry with complex Fourier analysis, we characterized the relative amplitude and phase of electronic dipoles excited from inner subshells to autoionizing states, which are modified by a few-cycle near-infrared femtosecond pulse. By precisely tuning the temporal gate width between DAPs, we could unveil the temporal behavior of the complex refractive index. Our spectroscopic scheme with DAPs will thus help to reveal the phase-resolved ultrafast electron dynamics and paves the way for attosecond coherent control in a broad XUV spectral range.
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